Stacker for tractors



8 DR m A m w m GF .R n .0 n S Jan. 16, 1951 3 Sheets-Sheet 1 Filed Feb. 2, 1949 Jan. 16, 1951 u, o, GUIGNARD 2,538,514

STACKER FOR TRACTORS Filed Feb. 2, 1949 3 Sheets-Sheet 2 AZZwwey:

Jan. 16, 1951 u. o. GUIGNARD 2,538,514

STACKER FOR TRACTORS Filed Feb. 2, 1949 s Sheets-Sheet 3 Patented Jan. 16, 1951 UNITED STATES PATENT 0 FFICE I STACKER FOR TRACTORS UlyssO'. Guignard; Minneapolis, dpplieationFebruary 2, 1949;. Serial No; 74428" which is of simple. and inexpensive construction whichwill notprojectabove or. behind the booms of. the loader. and which can be effectively used for maintaining the load carrier in a substantiallyhorizontal relation: as. the'booms. are raised from a position adjacent the ground to anupper position and which. willpermit ready dumping of the load, carrier when the booms are in the raised position under the control of the operator.

Another object is to provide anovel and imw proved: front. end loader including side booms and hydraulic jacks for raising and lowering the booms, the booms being so made that they can be raised. from a. positionadjacentthe ground to. a high elevation: andthe application of power from, the jacks being suchthat. as the; jacks are extended when the booms are in lowered position, substantial moments of. force exerted' by the: jacks will be men. upwarddirection.

The objects and advantages of the invention will more. fully appear from the following description made in connection with the accompanying drawings wherein like reference. char-- acters refer to thesame or similar parts throughout the different views, and in which Fig. 1- is a view in side. elevation illustrating a loader embodyingthe invention; applied to; a tractor, theparts being shown in: fulllines with the load carrier lowered and being shown in dotted'lines. with the load carrier raised,. and the loadcarrier in raised position. being shown in two'positions, anon-dumping position anda dumping position;

Fig 2 is a view in rear elevationv in enlar ed 'soalelooking toward the-rear upperportion of the loader structurfi;

Fig. 3 is a, plan view of the loader applied-to the tractor; I

Fig. 4-is a view infrontelevationof the loader applied to the tractor and I Fig. 5is a perspective view illustrating a slightly different embodiment of the invention-applied to'a tractor. a

Referring first to Figs. 1 tori inclusive, aytrac tor A: is. shown including a rear axlehousing 6, afront. frameextension l, a pQwer takeroit shaft 8,,and ast ringwheel 9-. I

In accordance with the: invention, there are provided one at, each; side of the. tractor,v two l p n r ckets lfloisllch type; as to fit 5 Claims. (01. 214-440) I the axle" housing 6 between the driving wheels of the" tractor and the main body ofthe tractor, and these brackets areelamped tothe'axle housing'at' these points. Fixedto. the. brackets I U and projecting first'diagonally upwardlyand rearwardly' therefrom and then vertically up; wardly are a pairof bars H interconnected at their upper ends by a cross tube 12, suitable diagonal braces. I3 extending between the loans H and the tube !2-. The cross tubeflzis firmly anchored in position by diagonal brace bars-M which, are connected at their. rearendsc-tofthe tube l2 and project downwardly and forwardly and are connected to plates l5 attached to forward portions of the frame '1 at the two sides of the tractor. The brackets 19, thebars .1 l .the tube i2, the diagonal braces l3, and the brace bars 14 form a strong frame designated as an entirety by the. letter B upstanding from" the rear portion of the tractor to carry the rear ends of the side booms of the loader.

A cross, shaft [6 is journaled inthe cross tube 7 l2 and pivotally connected to this cross: shaft 'lfi. area pair of side booms l! carrying forks l8 at their rear ends journaled on the shaft; [6 The booms ll when in their downwardly swung position project diagonally downwardly and for-e wardly from the cross-tube l2 and they are'projvided with forward portions which project di agonally downwardly andforwardly at a steeper angle ahead of the front end of the tractoltxA'. To strengthen these booms I! while still? pr viding a relatively light construction, each :boom is provided with a truss rod l9 connectedat its two ends to the end portions of the boom to which it is applied and spaced upwardly therefrom-by a plurality of struts 20 and running: over and secured to upstanding plates 2! located immediately forward of the forward end of the tracetor when the: booms are in their downwardly swung position. With this construction, it will be seen that each boom l! is verystrongly trussed.

Any one of a number ofdifierent types of load carriers such asgthe hay sweep C illustrated may be pivotally connected by pivots 22 to the; lower ends of. the two booms H.- The particular load carrier C illustrated includes a back frame-'23 carrying at its lower end a pair of apertured lugs 24 connected by the pivots 22 to;-the booms, and the carrier C also includesa number of forwardly projecting bottom. tines"; 25.- connected "together by across bar 26 in forwardly spaced? relation from-theback frame 23. The back frames2 3 also. in upwardly spaced relation from the tines 25 carries a pair of side tines 25a, and diagonal desired level up to the level of the dotted posiv tion'shown in Fig. 1 there are provided a pair of extensible hydraulic jacks 28 and one member of each jack, suchas the cylinder member 28a, is connected by a pivot 29 to a bracket I8, and the other member of the jack, such as the extensible member 281), is connected by a. pivot 30 to the interconnected ends of a pair of links 3| and 32. The links 3| are connected at their rear ends to the booms 'I1 and run forwardly from their rear ends to connect with the links 32 above the booms I1 and the links 32 are connected at their lower ends to the booms l1 forwardly of the tractor when the booms are lowered and these links 32 run upwardly from the booms to connect with the 1inks'3|. The links 32 are in turn cross connected by a cross bar 33 and by diagonal cross braces 34 to give the structure adequate strength and to maintain the pivot 30 in proper alignment relative to the jacks 28 and the booms |1. 'It will be seen that the links 3| and 32 at each side of the structure form two sides of a triangle, the third side being formed by a portion of the boom l1, and the apex of this triangle where the pivot 38 is located is disposed well above the level of the boom I1 when the boom is in downwardly swung position.' Accordingly, assuming that the booths l1 are in downwardly swung position, as the jacks 28 are extended, a strong moment of force applied by the jacks will be in an upward direction which will cause any load carried by the load carrier C to be easily raised from the ground during the initial raising movement of the booms |1.'

Pivotally mounted on the cross shaft |6 between the forks |8 carried by the booms l1 are sheaves 35, these sheaves in efiect being carried by the rear ends of the booms l1 and by the upper portions of the frame B. Connected by pivots 36 to the booms I1 forwardly from their rear ends are downwardly extending links 31. Cooperating links 38 are pivotally connected by pivots 39 at their rear ends to the bars H of the frame in downwardly spaced relationfrom the shaft 6 about which the booms l1 swing,

and these links 38 are in turn connected at their forward ends to the lower ends of the links 31 by pivots 40 on which sheaves 4| are journaled. The links 38 are preferably disposed in approximate'p'arallelism with the rearward portions of the booms l1 and it is preferable butnot en'- tirely'necessary that'the links 31 be disposed in parallelism with the vertical portions of the bars when booms H are in lowered position as shown in full lines Fig. 1. Other sheaves "42 are carried by brackets 43 mounted on the booms |1 located just forward of the tractor when the booms are in downwardly swung position, while other sheaves 44 are mounted on the pivots 33 which connect the rear ends of the links 38 to the bars ll of the frame A. Mounted in suitable V 4 trated the back frame 23 of the carrier is equipped with eyes 49 in alignment with the sheaves 42 and the forward ends of the cables 48 are attached to these eyes 49. From their forward ends the cables 48 run rearwardly first over the sheaves 42, thence rearwardly over the sheaves 35, thence diagonally downwardly and forwardly over the sheaves 4|, thence rearwardly over the sheaves 44 and the rear ends of these cables are secured to the winding drums 41 and normally rear portions of the cables are wound on these drums.

The drum shaft 46 inwardly from one of the bars'45 carries a spool 50 forming a nigger head. A short cable 5| is anchored at one end to the cross tube l2 and is wound several times around the nigger head 58 and the remaining end of this cable is attached to the rear end of a control lever 52 pivotally carried by the adjacent bar I. A coiled tension spring 53 is connected at one end to the rear end of the lever 52 and is connected at its other end to an arm 54' attached to and projecting rearwardly from the ad- 7 jacent bar Of course, the spool 58 forming the nigger head is fixed to the shaft 46 to ro tate therewith and this nigger head together with the cable 5|, the spring 53, the lever 52, and

52 is released will have enough power due tothe 1 wrapping of the cable 5| around the spool 56 to hold the wraps of the cable 5| tightly on the nigger head and thus prevent rotation of the shaft'46.

A coil spring 55 surrounds a'portion of the drum shaft 46 and this spring is connected at one end to one side of the nigger head 58 and is connected at its other end to a collar 56 carried conveniently as by one of the diagonal braces |3 of the frame B. The spring 55 is normally under tension to cause the drum shaft 43 to turn in a clockwise direction as viewed in Fig. 1 tending to cause portions of the cables 48 to be wound on the winding drums 41.

A suitable hydraulic pump 51 is provided carried as by a bracket 58 attached to the rear part of the tractor A. A power take-"off shaftfB of a the tractor runs into this pump and drives the same. The pump 51 in turn is connected by a bearings 45 attached to the rear sides of the bars near their upper ends is a drum shaft 48 carrying adjacent itsvtwo ends in alignment with the pulleys '35 a pair of winding drums 41. 48 are secured at'their forward ends to the carrier C above the pivots 22 on which the carrier may swing on the booms l1 and for the purpose of connecting the cables 48 to the carrier cillus Cables supplyconduit 59 to a liquid reservoir 68 mounted by a suitable bracket 6| to the rear portion of the tractor as above the level of the pump 51. A supply conduit 62 runs from the discharge outlet'of the pump 51 to a valve 63 supported within easy reach of the driver of the tractor and controlling flow through a conduit64 having branches running to the hydraulic cylinders 28a of the hydraulic jacks 28. Return flow conduits 65 run from the valve 63 back to the reservoir 60. The details of this hydraulic system are not illustrated but it will be understood that when the valve 63 is located in one position fluid will be drawnby the'pump 51 from the reservoir'68 through the conduit 59 and supplied through the conduit'62, valve ,63, and conduit 64 to the two cylinders 28a of the two "jacks 28 causing extension of the jacks, a second position of the valve 63 the -the conduit 65 back to the reservoir $13.

"HOW from the valve to the cylinders 258d will be -lowered as shown in full lines Fig. 1 and in' Figs. 3 and 4, that rearend-portions or the-cables 5-8 are Wound on the drums 41;, "and thedrum shaft 46 is held from rotation by the 'braike aifforded by the spool 5!), cable '51, lever =52, and spring 53, thedevice is ready for use. If the particular carrier '0 illustrated 'ismounted on thebooms H and hay is to be'stacked by' th'e loader, the tractor will be driven forwardly to carry the carrier into the'hay until a load 'is receivedby the carrier C. Thereupon, if desired, the valve 63 maybe turned to apositionto supply a 'sma-ll quantityof fluid-to the hydraulic jacks '28 causing "extension of these jacks slightly,

whereupon the valve 63 will *beaswung toaflsecond position to close -off communication betweenthe hydraulic jacks and both the supply-conduit 52 and the return conduit wallowing the iflu'idbeing pumped by the pump 5''! to "bypass "back to the reservoir 60. As -a small quantity of "fluid is initially supplied to the cylinders 28a of the jacks "2-8 the jacks willextend and the booms 1*! will booms ll still in lowered position-may be then driven to "the point where it is desired to dump the hay, whereupon through further operation of the-valve 56 additional fluid maybe supplied to the cylinders 28a of the jacks, causing the booms I! :to raise from their lowered position "to their upper position. Raising movement of the be raised slightly thereby lifting the carrier C above-the ground level. "The tractor with the booms can be stoppedat-any desiredlevel-through V actuation of the valve 63 and the "booms can "he held a tthis desire d" level.

As'the booms H raise from their *loweredposition upwardly the spacing between the sheaves Al and the sheaves 35 will decrease ,due to the linkageaiforded by the links 3i and 38. "This rolecrease in the spacing between the sheaves (l1 and -35 is sufiieient to gradually pay out a slight- "1y greater length of the cables 4.8, between the sheaves 35 and the eyes 4! of the carrier to which the forward ends of the cables are connected and accordingly the bottom of the carrier-=formed by=the tines Zdmaybemaintained in V substantially a horizontal plane during theraising of the booms 1?. It is, of course, possible to vary-the length-of the links 3'! and 3'3, so that if it is desiredto slightly tip up the forward portion-of the carrier 6 during the raising movement so as toprevent the possibility of portions of the :load dropping from the carrier, this can 7 be accomplished while the angle betweenthe forward end portions of the boomsil-andthe bottom of the carrier formed by the tines '25 is steadily increased.

now the booms i! have been raised to the height desired for dumping of the carrier C and it is desired to dump the carrier; the operator of the tractor will grasp the forward end of the lever 5-2 and push it downwardly againsttension of the spring 53, therebyloosening the cable 5| slightly on the nigger head 53! and allowing the niggerhead and-the shaft 46 to turn against cylinders 13a of the jacks is. to now back to assess-1a B the tension of the spring 55, the weight er the load on the vcarrier beingsufii'cient to overcome the tension of this spring. The cables flmimay anew lengthen I-between the sheaves ".35 and the connection of these cables to the carrier C and the carrier will swing -down from the uppermost dotted line position shown in F-ig. "-1 to the tower :dQtted' li-ne -position, thereby permitting dumping of theload. "The booms l are then lowered and has the carrier :"C strikes the gnoun-d the weight :of the carrier on the cables H3 is relieved and due to the direction :of winding o'f cable 51 ion the nigger head 50 the spring '55 =wi-ll=cause rear portio'ns or the cable :to be again wound-on the drums 41 without pressing lever 52 downwardly, whereupon the device -'-is read-y :for f-urtheruse.

R'e'ierrin anow to. Fig. 5, there 'is there showma :slightly different embodiment :of the i'invention which :differs .priricipalh -from the described em- .bodiment .in :respect to the (dumping control mechanism. It willthus be unnecessary to-.de- :scrihe tall the parts detail. The device :shown 'in Fig. 5 includes a:rear;-frame B' sub'stan- 'tially similar to "the .lframe JB previously :described. It includes Zbooms as similar to: the booms previously described :and carrying sheaves .61. similar to Ethasheaves :35. alternative iorm -of .carszier'E :is on the device illustrated :in Fig. :5, vshut this ;ar=rier is pivotally connected "to $116 booms $5 in generally :a -similar manner to the carrier .6, and 1031191651578 rare. employed which are connected to the rear 213011310118 'of "the carrier E above the point :of pivotal connection to the booms 66. These cables run .reanwardly over the sheaves v15"! .Bivotally connected to the booms {t6 :forwardly from the :pivots on which the booms a-swing are downwardly extendingalinks 69 connected by pivots "M at their "lower ends to links 1;! pivotally "connected :at their rear onds to the frame -D rbelow theepivotal axis on which the booms-66 swing. The ipivots H] carry sheaves and it willbe seen that as the .booms fifi are .raised, the" spacing between the sheaves 1 2 and the sheaves 2%?! will decrease'while as the booms =65 are:lowered, theispacing between these sheaves will increase. Fixed as to the links ll are hydraulic cylinders 13a of hydraulic jacks 1 3, and the extensible members lsb et these jacks run i'earw-ardly and carry at their rear ends sheaves M. The cylinders ita also'carryupstanding lugs l5 equipped with a plurality of spaced openin s the rear ends of-the cables are connected to the cable connectors 15 anchored on the cylinders 'i' da of the iaoks T3. -Suitable fluid connections are made between a first valve Tl which controls "the flow of fiuidto-the main jacks 7B which operate the booms '55, to a second valve 19 and fluid conduit '80 running to the cylinders 13a of the jacks 1-3 to supply fluid to these last named jacks. With the arrangement shown in Fig. 5 the booms 66 may operate as previously described.

The jacks 13 having been previously extended before the booms 56 are raised to dumping" position, when now it is desired to dump the load from the carrier E, it'is merely nece'ssar'yto ope ate the valve 191 to'all'ow the fluid fr'di'n the reservoir whereupon the length of the cable between the sheaves '51 *andtheir c'onn'e'c with the carrier E will be; allowed to "increase peremitting dumping of the carrier. After the dumping operation the valve l9 may be operated to supply fluid to the cylinders 73a, of the jacks ;73, thereby extending these jacks and returning the carrier E to thenon-dumping position. Due to the fact that the cables 68 travel rearwardly from the sheaves 172 over the sheaves M and thence forwardly to the point where the cables 'are anchored on the lugs 15, hydraulic jacks 13 may be employed which have comparatively short extension and yet the cables 63 may be slackened enough when desired to permit the dumping operation.

Itwill be seen thathighly effective tractor mounted loader constructions have been provided including leveling and dumpin controls for the carrier which will permit the booms to be raised to a high level and which will not project above -the booms or rearwardlyfromthe booms to be in the way of operations. It will also be seen that due to the overhead support of the forward :portions of the booms by the main hydraulic Jacks the load'can be readily lifted from the ground during the initial part of the upward :swinging movement of the booms with an expenditure of relatively low power.

. It will of course, be understood that various vchanges may be made in the form, details, ar-

rear

.pivotally sup-ported at forward portions of the booms, a leveling and dumping control for the carrier comprising a sheave carried by said frame :for rotation about the pivotal axis of said booms, a second sheave, means mountin said second sheave relative to said booths and said first sheave in such relation that'as the booms are .raised the spacing between the said two sheaves will decrease and as said booms are lowered the spacing between said two sheaves will increase, a cable attached at its forward end to said carrier above the point of pivotal connection of the carrier with said booms, said cable running rear- -wardly over said two sheaves, a winding drum .mounted for rotation on said frame, the rear end of said cable being attached to said windr ing drum for winding of a portion of the cable thereupon, a brake normally holding said winding drum against rotation but capable of release :to permit paying out of the cable from said wind- .ing drum to permit dumping of the carrier, and

a spring normally urging said drum to wind p-or 2. In a' tractor mounted loader having a rear framefside booms pivoted thereto at their rear ends, means for raising and lowering the forward portions 'of the booms, and a load carrier pivotany supported at forward portions of the booms,

a leveling and dumping control for the carrier comprising a first sheave pivoted on one of the booms, a pair of links having adjacent ends pivotally connected, a second sheave carried by said links at their point of pivotal connection, one of said links being pivotally connected to a boom forward of its pivotal connection to said frame, and the other link being pivotally connected to said frame in downwardly spaced relation from the pivotal connection of the boom to the frame, a cable attached at its forward end to said carrier above its point of pivotal connection to said booms, said cable running rearwardly over said two sheaves, a drum mounted for rotation on said frame and to which the rear end of said cable is attached after passing over said two sheaves, said drum capable of winding a portion of the cable thereon, a spring urging said drum to wind a portion of the cable thereon, and a brake controlling rotation of said drum, and a brake release permitting a portion of the cable to be unwound from the drum to permit dumping of the carrier, said drum including a drum shaft and said spring being a coil spring encircling the drum shaft connected at one end for movement with the drum and fixed at its other end.

3. In a tractor mounted loader having a rear frame, side booms pivoted thereto at their rear ends, means for raising and lowering the for ward portions of the booms, and a load carrier pivotally supported at forward portions of the booms, a leveling and dumping control for the carrier comprising a pair of sheaves located re-' spectively at the two sides of said frame and mounted for rotation about the pivotal axis about which the booms swing, a pair of links for each boom,the links of a pair being pivotally con heated, and one link of a pair being pivotally connected to its boom forward of the point where the boom is pivotally connected to the frame, and the remaining link ofthe pair being pivotally connected to the framein downwardly spaced relation-from the pivotal connection of the boom with the frame, a sheave carried by each pair of links at their point of pivotal interconnection, cables attached at their forward ends to said carrier above the pivotal connection of the carrier with said booms, each cable running rearwardly over the two sheaves at one side of the frame, a drum shaft'journaled on said frame, a pair of drums carried by said drum shaft and to which the rear ends of said cables are respectively connected for wind-up of rear portions of the cables on these drums, resilient means urging said drum shaft to wind. portions of the cables thereon and a brake controlling rotation of said drum shaft to release portions of the cables wound on said drums and allow dumping of the carrier.

4. In a tractor mounted loader having a rear frame, side booms pivoted thereto at their rear ends, means for raising and lowering forward portions of the booms, and a load carrier pivot ally supported at forward portions of the booms, a leveling anddumping control for the carrier comprising a first sheave pivoted on one of the booms, a second sheave, means mounting said second sheave relative to said booms and said first sheave in such relation that as the booms are raised the space between said two sheaves will decrease and as said booms are lowered the space between said two sheaves will increase, a cable attached at its forward end to said carrier above the point of pivotal connection of the carrier with said booms, said cable running rearwardly over said two sheaves, anchoring means for the rear end of said cable after passing over said two sheaves, a fluid operated jack including a fixed member and an extensible member, a sheave carried by said extensible member and over which said cable passes, said jack being mounted in such relation to said cable that as said jack is extended, the forward portion of said cable will be drawn rearwardly and as said jack is distended, the forward portion of said cable will be allowed to swing with said carrier downwardly, and means for extending and distending said jack.

5. In a tractor mounted loader having a rear frame, side booms pivoted thereto at their rear ends, means for raising and lowering the forward portions ofthe booms and a load carrier pivotally supported at forward portions of the booms, a leveling and dumping control for the carrier comprising a first sheave pivoted on one of the booms at its point of pivotal connection to said frame, a pair of links pivotally connected, one of which links is pivotally connected to one of the booms forwardly of the pivotal connection of 10 the frame, a second sheave carried by said links at the point where the links are pivotally connected, a hydraulic jack having a fixed portion attached to one of said links and an extensible portion, a sheave carried by the extensible portion of said jack, said cable after passing over said two first mentioned sheaves running over said last mentioned sheave, and an anchor fixed relative to the fixed portion of said jack and to which the rear end'of said cable is secured.

ULYSS O. GUIGNARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

